Do criminal penalties have any deterrent effect on drug addicts - people who already are willing to throw away their jobs, relationships, or even lives for their "fix"? What does brain science tell us about addicts' capacities to exert self control and to be held criminally responsible? This panel discussion brought together a leading neuroscientist of addiction, a criminal law scholar, and a former judge to ask whether the law should reconsider aspects of responsibility and punishment in light of new science about self-control.